1. J. Knobloch, SW meeting 4.12.97 1 ACOS Agenda 28.11.97 1.Corrections to the Minutes, Matters arising. 2.Discussion and decisions arising from the Software Workshop 3.Subsystem status and readiness for Christmas production 4.Clarification on domain architect names 5.LCB and FOCUS matters 6.Computing MoU 7.AOB

2. J. Knobloch, SW meeting 4.12.97 2 MoU Computing Institutes participating: ATLAS offline computing is a communal task of all Collaborating Institutes. The detector specific software will mostly be developed by the institutes participating in the detector construction. CERN will have to play a central role in coordinating the computing activities. This implies the coordination and the central support of the software development effort as well as the planning of the overall computing model and the implementation of its central part at CERN. Furthermore CERN as host laboratory provides computing support for the scientists of the collaboration during their stay at CERN. Introduction The ATLAS computing strategy is laid down in the Computing Technical Proposal (CERN/LHCC/96-43). The ATLAS software will be developed in a defined process involving requirements, design and coding - each being reviewed for quality assurance. The ATLAS data will be stored in an object-oriented database. Final details and a strategy of how and where to deploy the computing infrastructure will be defined when needed.

3. J. Knobloch, SW meeting 4.12.97 3 LHC++ Roadshow ATLAS impression We appreciate the progress made on the HEP-specific developments of Explorer. We plan to find out whether it represents a viable solution to the immediate needs of data analysis in an object oriented environment together with our database strategy. We will now enter an intensive evaluation phase and will encourage ATLAS members to participate in the training sessions planned in January 98. Concerns –Licensing in the long term –Availability on all used platforms/compiler –Speed and scalability

4. J. Knobloch, SW meeting 4.12.97 4 ROOT A growing number of individual members of the ATLAS physics community have found it interesting to use ROOT for specific fast simulation purposes. The evaluation of this scheme will continue.

5. J. Knobloch, SW meeting 4.12.97 5 Computing Management In the current situation where many conflicting issues come up, the ATLAS computing coordinator has to propose decisions which cannot always be consensual. It will however be tried to get as broad a consensus as possible. In all cases, the decisions will be submitted to ACOS for approval. I propose to submit a bi-weekly “Computing Coordinator Report” - to ACOS and to ATLAS-SW. It will include links to relevant web-pages. –The reports from meetings are for rapid information and ATLAS internal use. They do not substitute official minutes If necessary and possible, important information will be transmitted rapidly.

6. J. Knobloch, SW meeting 4.12.97 6 11/97 Workshop outcome ASP - include practical issues –Using SRT(C.O.) –Testing (R.C.) –Feedback from reviews and rampups (SF) –External software (J. H.) –Maintenance (H. M.) Review choice of design tool next spring World wide computing group –Virtual room –LHC++ license - 50kCHF/y/experiment –Plenary session - operator? Microphone?

7. J. Knobloch, SW meeting 4.12.97 7 Workshop outcome (2) Control Domain –Extensions to ARVE - data flow (R.C.) –C++ inside Java beans (S.F.) –Dataflow in C++ (L.T.) Decisions –go ahead with Lassi’s proposal inside Arve –keep Java beans as reserve –LHCC milestone - April 98 taken seriously –Announce how to use Arve –Try C++ scripting language - CINT

8. J. Knobloch, SW meeting 4.12.97 8 Workshop outcome (3) Reconstruction - Gilbert –ATRECON –Packages iPatRec full OO version - intermediat end 97 Xkalman++ (I. Gavrilenko) +Sian Yang –Q: ARVE context ASTRA based on H. Drevermann –How to proceed to move to OO? Need help to use design tools Merge of two reconstruction groups –Calorimetry - no OO yet –e/gamma algorithms - OO? –Muon - ID + Muon spectrometer –Event filter wants C++ Calorimeter code -->C++ –Reconstruction meeting December

9. J. Knobloch, SW meeting 4.12.97 9 Workshop outcome (4) Domain Interface Group decisions –Continue with Arve rampup –Communication between components has to be lighweight - not BaBar event style –Graphics - promote bridging to existing SW –Review SRT –Project plan to be completed –g++ compliance lifted Get people on board (OO) –Profiler –Training –Mentoring –Training, help point, ATLAS specific –Realize that produce prototype

10. J. Knobloch, SW meeting 4.12.97 10 Database –Geant3 digits -> Objectivity –(missed something) –connecting cvs and Objectivity - versioning –CDF Run-II with Objectivity - 0.4 PB/y in 2000 interface to YBOS (FORTRAN) –ALICE HPSS proposal LCB relation to HPSS viewed favourably Tutorial on how to use StP

11. J. Knobloch, SW meeting 4.12.97 11 ACOS Decisions Control domain choices accepted: ARVE with L. Tuura's component model will be pusued. Java Beans will be kept as an option. L. Tuura new Control Domain architect. Reconstruction domain to be unified. JK's proposal for ATLAS opinion on LHC++ roadshow accepted. MoU - check milestones, financial aspects, clarify host lab aspects. The deadline for code sumission for big productions starting before Christmas was fixed to 5 December. It was decided to revisit the domain decomposition and to re-populate those domains which have insufficiant participation.